Apollo Client query deduplication incorrectly deduplicates similar GraphQL operations with different files in variables#351

When executing the same mutation with the same variables but with a different file in parallel, Apollo thinks that the request is the same, and will just wait for the first one to complete and returns that a response for all of them. I have found out that setting `queryDeduplication` to `false` in Apollo (default is `true`), will fix this behavior. The reason for this is because with `apollo-upload-client`, the variables that go into Apollo are indeed exactly the same, so it thinks they are the same. Is there anything that can be done about this? Perhaps adding a random dummy string (or a file hash) in place where the file will be mapped? If not, it might be good to add information about this in the docs.